Post-recovery ocean glider data from Seagliders deployed in the North Sea during the AlterEco project, November 2017-April 2019 (version 2).

As part of the Alternative Framework to Assess Marine Ecosystem Functioning in Shelf Seas (AlterECO) project (NERC grant reference NE/P013902/1), Seagliders (SG537, SG620, SG510, SG579, SG602 and SG550) were deployed in a physically dynamic region of the North Sea, known to undergo seasonal oxygen depletion, between November 2017 and April 2019. These deployments are part of an 18-month observational programme using marine autonomous vehicles. During each deployment the gliders tracked repeat North-South or East-West transects close to Dogger Bank. Each glider carried a standard CTD package measuring temperature and water conductivity (salinity) and an oxygen optode sensor with additional sensors such as downwelling PAR and optical sensors for chlorophyll fluorescence and backscatter. Nitrate and phosphate sensors were also included, and these data will be available separately. The deployments provided high resolution measurements of key hydrographical and biogeochemical parameters. In the previous version of the dataset, there were errors found in the positional record for deployment AE3 SG510. This was due to a bug in the processing routines when working with upcast only dives. This has been corrected in this version of the data where the values have been filled with the actual GPS fixes (single points per dive). During the 3-year programme and by developing and implementing a novel monitoring framework, AlterEco aims to deliver an improved spatio-temporal understanding of shelf sea function and provide measurements of critical indicators of marine ecosystem health over seasonal timescales.

作为《陆架海域海洋生态系统功能评估替代框架》（Alternative Framework to Assess Marine Ecosystem Functioning in Shelf Seas，简称AlterECO）项目的一部分，该项目获英国自然环境研究委员会（Natural Environment Research Council, NERC）资助，资助编号为NE/P013902/1。研究团队于2017年11月至2019年4月间，在北海一处具有强物理动力特征、已知会发生季节性缺氧的区域，部署了6台海洋滑翔机（Seagliders），型号分别为SG537、SG620、SG510、SG579、SG602及SG550。这些部署属于一项为期18个月的海洋自主观测计划的组成部分。每次部署期间，滑翔机均在多格滩（Dogger Bank）附近沿南北向或东西向开展重复断面观测。每台滑翔机搭载了标准温盐深仪（CTD）组件，用于测量水体温度与电导率（盐度），同时搭载溶氧光学传感器（optode），以及下行光合有效辐射（PAR）传感器、用于叶绿素荧光与后向散射检测的光学传感器等配套设备。此外还搭载了硝酸盐与磷酸盐传感器，此类观测数据将单独对外发布。本次部署获取了关键水文与生物地球化学参数的高分辨率观测数据。在该数据集的过往版本中，部署任务AE3 SG510的位置记录存在错误，该问题源于仅处理上浮潜次的处理程序存在漏洞。本版数据已完成修正，将原位置值替换为实际GPS定位点（每次潜次对应单个定位点）。在这项为期3年的观测计划中，AlterECO项目旨在通过构建并应用新型监测框架，深化对陆架海域生态系统功能的时空认知，并提供季节尺度下海洋生态系统健康关键指标的观测数据。